Patent US4010235A successfully refreshed from Google Patents.
US4010235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moulded plastic-rubber composites
Assignee: Dunlop Ltd
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Filing: 1975-04-17
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Granted: 1977-03-01
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Expires: 1995-04-17
Abstract
Abstract A method of producing a moulded plastic-rubber composite comprising injection or transfer moulding a thermoplastic high pressure polymerized ethylene polymer so that it is brought, in a molten state, into contact with a prevulcanized rubber component containing up to 55 per cent by volume of a rubbery olefin polymer. The plastic-rubber composite produced by this method may be used in applications in which hitherto rubber-metal composites have been used, for example valve diaphragms, tire valve bodies, shock absorbers, engine mountings, vibration dampers, compression springs, torsion bushes, flexible drive couplings etc., of which the following is a specification.
Inventors
- 👤 James Frank Yardley
- 👤 Allen Frederick Nightingale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:14
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/12; C08J5/121; Y; Y10; Y10T; Y10T428/00; Y10T428/27
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
172 words
A method of producing a bonded molded plastic-rubber composite comprising injection or transfer molding a thermoplastic, high pressure polymerized ethylene polymer having a melt index or minimum flow rate of not less than 0.25, when measured according to the test conditions specified in ASTM Standard D 1238-65T, so that it is brought, in a molten state, into contact with a prevulcanized rubber component containing from 5 to 55 per cent by volume of a rubbery olefin polymer selected from the group consisting of ethylene/propylene copolymers containing from 20 to 85 mole per cent units derived from ethylene, ethylene/alpha-olefin/diene terpolymers containing from 20 to 85 mole per cent units derived from ethylene and from 0.1 to 10 mole per cent units derived from the diene, and a blend containing one or more of these with up to 80 per cent by weight of at least one other rubber selected from the group consisting of styrenebutadiene rubber, polybutadiene, and polyisoprene, the remainder of the composition comprising ingredients normally used in compounding rubbery olefin polymers.
Claim 2
Independent Claim
172 words
A method of producing a bonded molded plastic-rubber composite comprising injection or transfer molding a thermoplastic, high pressure polymerized ethylene polymer having a melt index or minimum flow rate of not less than 0.25, when measured according to the test conditions specified in ASTM Standard D 1238-65T, so that it is brought, in a molten state, into contact with a prevulcanized rubber component containing from 5 to 55 per cent by volume of a rubbery olefin polymer selected from the group consisting of ethylene/propylene copolymers containing from 20 to 85 mole per cent units derived from ethylene, ethylene/alpha-olefin/diene terpolymers containing from 20 to 85 mole per cent units derived from ethylene and from 0.1 to 10 mole per cent units derived from the diene, and a blend containing one or more of these with up to 80 per cent by weight of at least one other rubber selected from the group consisting of styrenebutadiene rubber, polybutadiene, and polyisoprene, the remainder of the composition comprising ingredients normally used in compounding rubbery olefin polymers.
Claim 3
Dependent Claim
24 words
A method according to claim 1 in which the prevulcanized rubber component contains from 5 to 35 per cent of a rubbery olefin polymer.
Claim 4
Dependent Claim
26 words
A method according to claim 1 in which the rubber composition comprises in addition to the rubbery olefin polymer, one or more fillers and/or extending oils.
Claim 5
Dependent Claim
20 words
A method according to claim 1 in which the thermoplastic high pressure polymerized ethylene polymer is a low density polyethylene.
Claim 6
Dependent Claim
20 words
A method according to claim 1 in which the thermoplastic high pressure polymerized polymer is a crystalline copolymer of ethylene.
Claim 7
Dependent Claim
32 words
A method according to claim 5 in which the ethylene is copolymerized with a monomer selected from the group consisting of a vinyl alkanoic ester, an alkyl acrylate and a vinyl halide.
Claim 8
Dependent Claim
28 words
A method according to claim 5 in which the ethylene is copolymerized with a monomer selected from the group consisting of vinyl acetate, ethyl acrylate or vinyl chloride.
References Cited (Backward Citations)
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US3176057A
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US3287485A
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US3388212A
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US3660224A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |